As a professional M/B tech one of my pet peeves is finding the 13mm oil drain plug rounded over. I mean come on, if you don't actually have a metric tool set a 1/2 inch is a near perfect equilivent to a 13mm. Considering that either is probably the MOST COMMON BOLT SIZE EVER it must take someone special to round over all six corners of the hex with what I'd assume is a combination of channel locks, vice grips, and a hammer.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff